Ooh, I have a black walnut in the front yard I plan to cut down, may make a bit more conventional AR with some nice wood. I’d have to think it would take a standard mag, but they CNC their own receivers, and I haven’t been able to determine if they’re “special” in that way. At $2500, it’s not like a whole order of magnitude outside AR prices these days. They also make a TAR-10, a 1911, and several lever action rifles. Good stuff, pricy but not outrageous.